How many moles of atoms are in 5.00 g of 13C
1 answer:
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Answer : The coefficient of hydrogen gas in the balanced equation is, 4
Explanation :
Balanced chemical reaction : It is defined as the reaction in which the number of atoms of individual elements present on reactant side must be equal to the product side.
Single replacement reaction : It is defined as a reaction in which the the more reactive element replace the less reactive element.
The balanced chemical reaction will be:
In this reaction, lead is more reactive element than hydrogen so it can displace hydrogen element form its compound and form lead(IV) nitrate.
Thus, the coefficient of hydrogen gas in the balanced equation is, 4
Answer: B. warming ice to produce water
Explanation:
A physical change is defined as a change in which there is alteration in shape, size etc. No new substance gets formed in these reactions. Example: Melting of ice
A chemical change is defined as a change in which a change in chemical composition takes place. A new substance is formed in these reactions. Example: Corrosion of iron called as rusting.
Endothermic reactions are those in which heat is absorbed by the system and exothermic reactions are those in which heat is released by the system.
A. heating a rock to make it hot : It requires addition of energy and does not involve any change.
B. warming ice to produce water : It requires addition of energy and is a physical change
C. igniting a hydrogen-filled balloon: It needs energy and is a chemical change
D. burning paper to produce and carbon : It releases energy and is a chemical change